FILE - In this Aug. 20, 1970, file photo, Charles Manson followers, from left, Susan Atkins, Patricia Krenwinkel and Leslie Van Houten walk to court to appear for their roles in the 1969 cult killings of seven people in Los Angeles. Atkins estified she was

LOS ANGELES (AP) — Stephen Kay was a fresh-faced prosecutor just 27 years old and three years out of law school when circumstances handed him the Manson "family" murder case.

Over the next half-century, it would come to define his career and lead to death threats that to this day he worries a Charles Manson sycophant might try to carry out.

"I don't dwell on it, but I'm careful. I always look around to see if I'm being followed or anything," the retired prosecutor said recently as he paused to discuss the case that punctured the peace, love and happiness movement that flowered in the late 1960s.

Kay helped lock up Manson family members but never really relinquished the case in his decades with the Los Angeles County district attorney's office. He attended some 60 parole hearings over the years where he argued the killers should never be released.

"The crime was simply too heinous," he said. 

It was 50 years ago this week that Manson, a small-time career criminal who had reinvented himself as a hippie guru, dispatched a band of disaffected young followers on a deadly weekend rampage that would terrorize Los Angeles and forever imprint on the American consciousness the image of the slight, steely-eyed cult leader as the face of evil.

On that first night, Aug. 8, 1969, Manson sent a handful of his young, mostly female followers to the palatial hilltop estate of actress Sharon Tate with orders to kill everyone there. The 26-year-old actress and four friends were bludgeoned, shot and stabbed scores of times. Their blood was used to scrawl the words "Pigs" and "Helter Skelter" on the walls.

Tate, the wife of director Roman Polanski, was 8½ months pregnant, and her killers later testified that she pleaded in her last moments for her unborn baby's life. Others killed were coffee heiress Abigail Folger, celebrity hairstylist Jay Sebring and Wojciech Frykowski, an aspiring screenwriter and friend of Polanski, who was out of town.

On the way into the estate, the attackers crossed paths with 19-year-old Steven Parent, who was leaving after visiting an acquaintance who lived in the guesthouse. Parent was shot to death.

The next night, Manson himself led a handful of followers to the home of wealthy grocer Leno LaBianca and his wife, Rosemary, tying up the couple and leaving the others to butcher them with knives.

Authorities would say later that it was part of a plot Manson hatched to persuade gullible young followers to launch a race war that only he could hide them from. He'd gotten the premonition, they said, from a twisted interpretation of the Beatles song "Helter Skelter."

The killers went on trial the following year, and Kay joined the prosecution team two months later after the original lead prosecutor was dismissed and Vincent Bugliosi took over. Bugliosi's subsequent book "Helter Skelter" became one of the best-selling crime tales of all time.

Kay, 76, spent nearly 40 years in the Los Angeles County district attorney's office. He says the Manson trial was "definitely the most bizarre" case he ever tried, adding: "It was almost a circus."

The cult leader and his followers carved Xs into their foreheads to show their disdain for society. At one point, Manson leaped over the defense table with a pencil in hand and shouted at the judge that someone should cut off his head. At another, he grabbed a newspaper with a headline declaring President Richard Nixon had concluded he was guilty and held it up for the jury to see.

Outside the courthouse, Manson followers not implicated in the killings gathered daily to sing songs and even threaten to set themselves on fire. One day, two young female followers sneaked up alongside Kay in the courthouse parking lot.

"They said they were going to do to my house what was done at the Tate house," he said, adding both he and Bugliosi, who died in 2015, retained bodyguards throughout the trial.

Over the years, Manson, who died in 2017, would threaten Kay's life from behind bars.

When that trial was completed after nearly a year, Manson and three followers — Susan Atkins, Leslie Van Houten and Patricia Krenwinkel — were sentenced to death but later had their punishment reduced to life in prison. Atkins also died while serving her term, in 2009.

Another disciple, Charles "Tex" Watson, fled to his native Texas after the killings and fought extradition for nearly a year. When he returned, Bugliosi and Kay, now co-counsels, won his conviction.

Van Houten, whose attorney vanished during the first trial and was later found dead under mysterious circumstances, was granted a retrial in 1976. By then Bugliosi had left the Los Angeles County district attorney's office, and Kay was the sole lead prosecutor.

After a hung jury, he won a conviction in 1978, and Van Houten returned to prison, where she has earned bachelor's and master's degrees in counseling and leads programs to rehabilitate fellow inmates. She was recommended for parole three times in recent years, but each time the governor blocked the recommendation.

"I admit that she's a model prisoner, and I commend her for that, and I think she should keep doing her good work in prison," Kay said. "But you know, the victims in this case were dead and buried in 1969. They don't get any parole."

Retired for several years now, Kay still keeps in touch with Sharon Tate's younger sister, Debra, having grown close to the family during the trials and numerous parole hearings.

Meanwhile, new books and films about Manson seem to come out every year, but Kay says people shouldn't expect one from him.

"It would be nice if it would just go away," he said of the public's continuing fascination with Manson.

"But," he quickly added, "it's the case that never goes away."

FILE - In this Jan. 25, 1971, file photo, three members of Charles Manson's hippie style clan leave a Los Angeles courtroom just after being found guilty, along with Manson of first degree murder, in Los Angeles. From left are Patricia Krenwinkel, Susan Atkins and Leslie Van Houten. (AP Photo/Pool, File)
FILE - This Dec. 3, 1969, file photo shows Charles Manson en route to court in Independence, Calif., following his arrest at nearby Barker Ranch. Fifty years ago Charles Manson dispatched a group of disaffected young hippie followers on a two-night killing spree that terrorized Los Angeles and in the years since has come to represent the face of evil. On successive nights in August 1969, the so-called Manson family murdered seven people. (AP Photo/Harold Filan, File)
FILE - In this June 25, 1970, file photo, Charles Manson sticks his tongue out at photographers as he appears in a Santa Monica, Calif., courtroom on, charged with the slaying of musician Gary Hinman. Fifty years ago Charles Manson dispatched a group of disaffected young hippie followers on a two-night killing spree that terrorized Los Angeles and in the years since has come to represent the face of evil. On successive nights in August 1969, the so-called Manson family murdered seven people. (AP Photo/George Brich, File)
FILE - This file combination of images shows the five victims slain the night of Aug. 9, 1969 at the Benedict Canyon Estate of Roman Polanski and Sharon Tate. From left, Wojciech Frykowski, Sharon Tate, Stephen Parent, Jay Sebring, and Abigail Folger. (AP Photo/File)
FILE - In this Jan. 26, 1971, file photo, Manson trial chief prosecutor Vincent Bugliosi talks with reporters outside a Los Angeles courtroom. Bugliosi was an ambitious but anonymous deputy district attorney when he was handed the Manson Family murder trial after a more experienced prosecutor was removed for mocking one of the defendants to reporters. He denounced Manson as the
FILE - In this March 7, 2013 file photo, former Los Angeles prosecutor Vincent Bugliosi sits next to his book:
FILE - This Aug. 14, 2017 file photo provided by the California Department of Corrections and Rehabilitation shows Charles Manson. Fifty years ago Charles Manson dispatched a group of disaffected young hippie followers on a two-night killing spree that terrorized Los Angeles and in the years since has come to represent the face of evil. On successive nights in August 1969, the so-called Manson family murdered seven people. Manson died in prison on Nov. 19, 2017. (California Department of Corrections and Rehabilitation via AP, File)
FILE - In this Feb. 9, 1989 file photo, Los Angeles Deputy District Attorney Stephen Kay holds up a magazine profiling convicted murderer Charles Manson while delivering his closing statement at Manson's parole hearing at San Quentin Prison, Calif. Manson was denied parole for the seventh time. Kay was a 27-year-old deputy district attorney just three years out of law school when he joined the prosecution team two months into the Manson Family murders trial. In subsequent years he would attend some 60 parole hearings to argue that the killers never be released from prison, a position that Kay, now in his 70s, still maintains. (AP Photo/Eric Risberg, File)
FILE - This Dec. 22, 1970 file photo shows Charles Manson family members, Bruce Davis, left, and Steve Grogan, leaving court after a hearing in Los Angeles. Fifty years ago Charles Manson dispatched a group of disaffected young hippie followers on a two-night killing spree that terrorized Los Angeles and in the years since has come to represent the face of evil. On successive nights in August 1969, the so-called Manson family murdered seven people. (AP Photo/Harold Filan, File)
FILE - In this 1969 file photo, Charles Manson is escorted to his arraignment on conspiracy-murder charges in connection with the Sharon Tate murder case in Los Angeles. Fifty years ago Charles Manson dispatched a group of disaffected young hippie followers on a two-night killing spree that terrorized Los Angeles and in the years since has come to represent the face of evil. On successive nights in August 1969, the so-called Manson family murdered seven people. (AP Photo/File)